Radio receiving set



Jan. .12 1926.

L. T. CARL'EI' AL RADIO RECEIVING. SET

' s Shots-SheQt 1 /////////////////////////////E Filed Jan. 21, 1924 'Jan. 12 1926, 1,569,354

L. T. CARL ET AL RADIO RECEIVING SET Filed Jan. 21, 1924 3 Sheets-Sheet 2 0,7 I z I 7 atto'znaq Jan. 12 ,1926. 1,569,354

1 L. T. CARL ET AL WM Filed Jan. 21, 1924 3 Sheets-Sheet} G70 i i 56E I U 6 2 4 w t Z Zlwuentow .l'. G -6 1S. Gd

' semble the several Patented Jan. 12, 1926.

urrso srA'rns T FFlCEi LOUIE T. CARL AND ALBERT S. CARL, OF WINONA, MISSISSIPPI.

RADIO RECEIVING: SET.

Application filed January 21. 1924.

T 0 all wlzom it may concern:

Be it known that we, LoUIn T. CARL and ALBERT S. CARL, citizens of the United States, residing at Winona, in the county of Montgomery and State of Mississippi, have invented certain new' and useful Improvements in Radio Receiving .Sets, of which the following is a specification.

This invention relates to improvements in radio receiving sets and apparatus, and particularly to the assembly and mounting of the several elements of the set.

An object of the invention is to provide a radio receivingset having the receiving elements mounted in compact relation so that substantially direct connection may be made between the several elements for placing them in proper circuit relation for eliminating bus wires and other connecting wires in common use and thereby eliminating local interference noise affecting the efiicient reception of radio waves.

- Another object of the invention is to asarts of the receiving apparatus for provi ing substantially direct contact between the terminals of the elements and forming ,the terminal carrying parts of the structure with slots between the adjacent terminals so that air gaps are provided between the difl'erent part of the circuit of the receiving apparatus to increase the insulating qualities in the set and to prevent dust, dampness and other foreign matter which accumulate on the supporting structure for the several receiving elements, and causes leakage in the circuit.

' A further object of the invention is to rovide a condenser structure including a Bracket mounted on one'side of the slot in the panel for supporting a plurality of stameans in the rotary shaft for moving the movable condenser element considerably slower than the operation of the operating element in order to obtain a; more eflicient adjustment of the relation between the condenser elements.

The invention also comprehends other ob- Serial No. 687,541.

construction which are directed toward eliminating undesirable noise and induction in the set, and for providing a structure in which the circuit connections are made with a minimumamount of wire and which results' in a compact assembly of the parts so Figure 3 is a vertical transverse section thru a portion of the panel, showing the manner of mounting the condenser elemen and a stationary. tuning coil. 2

Figure 4 is a sectional view, taken on the line 5-5 of Figure 1 showing a rear'view of a portion of the panel assembly.

Figure 5 is a rear elevation of the panel assembly with the tuning coils removed from their mountings.

Figure 6 is a side elevation of a portion of the coil and block shown in Fig. 1.

Figure 7 is a detail view of the upper parallel portion of the frame carried by the auxiliary panel, showing the main contact terminals mounted thereon and the slot formed therein to provide air gaps between these terminals and portions of the feet of the lamp holding frame secured to said parallel portion.

Figure 8 is a detail sectional view thru one of the lamp contact receiving sockets shown in Fig. 7.

1 indicates the main panel of the receiving set which forms the front of the open ended casing 2, providing a housing for the receiving instruments and mountings for the set to protect the same against dust and other foreign matter. An auxili'ary panel 3 is mounted in the rear of the main panel inspaced relation therewith through the use of spacing elements 4, the said auxiliary panel being of relatlvely small size and ca ing a member 5 composed of upper an lower spaced parallel portions 6 and '7, respectivel com with and ext nding reorwa y from the 8 between the rear ends of the parallel portion for holding them in spaced relation and cooperating therewith and with the auxiliary ane to provide means for .mounting t e receiving instrument relative to the panels.

The auxiliary panel 3 is formed withthe horizontally extending slot 9 in the central.

portion thereof between the upper and lower frame portions 6 and 7 to provide an air gap between the bracket members 10 and 11 mounted on the panel. The bracket member 10 is formed with a sleeve extension 12 which receives a rod 13 on which is mounted. aplurality of stationary condenser plates 14 in spaced relation with one another; The outer end of the rod 13 extends through an opening 15 in the connecting portion 8 of the frame 5 to provide an air gap around the ends of the rod with respect to the frame, one part of the separable contact members 16 being mounted on the end of said rod, while the other part thereof is carried by a connection block 17 which mounts the stationary tuning coil 18 through the contact member 1.6 and another contact member 19 formed of separable sections, one of which is carried by the block 17 and theother being mounted in the connecting portion 8 of the frame, whereby one terminal of the coil 18 is directly connected with the condenser and is removably mounted relative to the auxiliary panel through the separable contact members 16 and 19. The connection block 17 is provided with a slot 20 extend ing tranversely of the block to provide an air gap between the separable contact members 16 and 19 for the purpose of increasing the resistance between the circuits in which these members are located for pre venting leaks and local interference.

The stationary condenser plates 14 are formed of substantially semi-circular plates provided with openings 21 located adjacent the straight edge of the plate and to one side of the center, each plate being provided with a recess 22 at the other side of the center for purposes to be presently described.

The bracket 11 forms a bearing for reta-tably mounting a shaft 23 which is adapted to receive on the inwardly projecting end thereof a plurality of spaced semi-circular movable condenser plates 24 positioned between the plates 14 and mounted on the shaft 23 to one side of the central portion thereof and formed with recesses to the other side of the central portion in a similar manner to the construction of i the plates 14 above described. This is to provide for a cooperation between these plates in the rotatlon of the shaft 28, so that the opposed area of the plates in inplate as clearly shown in Fig. 4 of the drawings in order that the entire surfaces of both sets of plates may be opposed to one another. e

A separable contact member 25 having relatively rotatable parts has one of the parts mounted on the ends of the shaft 23 and the cooperating parts mounted in the connecting part 8 of the frame 5, so that a connection between a desired stationary instrument and the movable condenser plate may be effected. A suitable form of rernier dial may be mounted on the forward end of. the shaft 23, for adjusting the movable condenser plate with micrometric-fineness to secure good tuning.

The upper parallel portion of the frame 5 is formed adjacent the rear edge thereof with cross slots 41- bctween which are mounted resilient sockets 45 for receiving the contacts of the usual bulb 46 used in the receiving circuit, each of the contacts having an air ga between them by reason of the slots 44. ach of the sockets 45 is composed of a plate 46 having an inclined extension 47 to provide means for receiving an attachment screw for connecting circuit wires thereto, and a plurality of resilient fingers 48 which receive and make contact with the de ending contact points on the bulb 46, a e ending extension 49 extending through t e part 6 of the frame, and receiving nuts 50 adapted for securing the sockets to the frame. A skeleton holder is also provided for the lamp 46 and includes a ring 51 provided with a plurality of lateral extensions 52 formed at their lower ends into securing feet 53 ada ted to be secured to the upper portion 6 o the frame in any suitable manner, the ring 51 receiving the base of the lamp 46 when the contacts are in engagement with the resilient socket and giroviding a firm mounting for the bulb. rheostat 54 is mounted on the brackets 56 and cooperating roller brackets 57 pivotally mounting bracket members 58 through the medium of the pivot pins 59, the rear ends of the brackets being provided with plates 60 extending laterally from the bracket members toward the frame member 5. The ends of these plates adjacent the frame member are provided with pairs of contact members 61, each being formed of cooperating sections, one section of each contact member being mounted on the plate while the other section of each contact member is mounted on blocks 62 carrying movable coils 63, the terminals of which are .connected with the contacts. The blocks (32 are similar in construction with the block 17 and are provided with .slots providing an air gap between the contact members as indicated by dotted lines in Figure 2. Each of the plates 60 is slotted as at 64 between the mountings of the contact members to provide an air gap for adding resistance between the contacts to prevent leakage in the circuit to the coils.

The bracket members 58 are rotatable on,

their pivots and carry worm gears ()5 at their upper ends with which mesh the worm 66 mounted on the shafts 67 which are rotatable in the bearings of said brackets 58 and extend through openings in the auxiliary panel and the main panel for re ceiving operating handles 68 and dials 69 on the outer end thereof in front of the panel to provide manual means of moving the coils 63 relative to one another and they coil 18.

The panel 1 is fprovided with the usual si ht opening 70 or viewing the filaments o the lamp 46.

In the arrangement of the parts above described, it will be noted that very little wire is needed to connect the several instruments of the receiving set, which may be arranged in a circuit. for receiving radio messages in any desirable manner for producing the desirable results, several forms of circuits using the apparatus above described being well known in the art.

It will be noted from the above descrip-' denser element mounted on the panel within the portions of the frame, stationary coil mountings provided directly in connection with the condenser elements, and the lamp mounting carried by the frame in close proximity to the condenser and coils so that short wires may be used for-connecting these parts in the circuit in order to prevent internal inductance in the set.

What is claimed is:

1. A tuning unit mounting including a panel having a horizontally extending slot in the central portion, a pair of bracket members mounted on the rear side of the panel at opposite sides of the slotted portion and having tubular extensions thereon, a rod mounted in and extending from the tubular extension of the upper bracket, said rod being adapted to receive a plurality of stationary condenser plates for mounting inspaced relation thereon, the end of the rod being adapted to receive a circuit connection, a shaft rotatable in the sleeve extension and bracket on the lower side of the slot, said shaft being adapted to mount a plurality of movable condenser plates in spaced relation between the stationary plates, a contact member mounted on the inner end of said shaft having relatively rotatable sections, one of the sections being free from the shaft, and an operating disc on the outer end of the shaft in front of the panel.

2. A tuning unit mounting including an auxiliary panel adapted to be mounted in the rear of a main anel, said auxiliary panel having a slot ormed in the central portion, a pair of bracket members mounted on the auxiliary panel at opposite sides of said slot having tubular extensions thereon, a rod removably mounted in one of the bracket members, a plurality of stationary condenser plates mounted in spaced relation on said rod, a shaft rotatable in the other bracket member and extending through the auxiliary panel, and a plurality of movable condenser lates mounted in spaced relation on the shaft and extending between the stationary plates.

3. A radio tuning unit, includin a panel having a slot formed in the centra portion thereof, a pair of bracket members mounted on the rear side of the panel at op osite sides of the slotted portion and formed with tubular extensions, a rod mounted in and extending from the tubular extension on the upper bracket, a plurality of stationary condenser plates of semi-circular form having bulged portions at one side of the center of the straight edgethereof provided with openings for receiving said rod and provided with recessed portions on the opposite sides of the center thereof, said plates being mounted in spaced superposed relation on said rod, a shaft rotatable in the sleeve extension and bracket on the lower side of the slot, said shaft being received by the recesses in the stationary condenser plates and spaced from said plates, a plurality of movable condenser plates of semi-circular form having bulge portions at one side of the center of the straight edge thereof provided with openings for receiving the shaft and formed with recesses at the opposite side of the'center on the straight edge thereof for receiving the rod mounting the stationary condenser plate, said movable condenser plates being mounted in spaced relation on said shaft for cooperation and movement between the stationary condenser plates whereby the mounting of the plates at one side of the center thereof on-the rod and shaft respectively and the provision of recesses at the other side of the center of the plate provide means for permitting the movement K of the plates into superposed relation for obtaining a maximum capacity in the circuit, and operating means on the front face of the panel for permitting the manual adjustment of the movable condenser plates relative to the stationary plates.

4. A tuning unit mounting comprising an auxiliary panel adapted for mounting on the panel of aradio set, a frame member mounted on said auxiliary panel and projecting laterally therefrom, a pair of bracket members mounted in adjacent relation on the auxiliary panel, said panel being formed LOUIE T. CARL. ALBERT S. CARL. 

